Finding the Fourth Proportional to 99,431.27, 137,215.18 and 54,719.27

Step by Step Solution

1. Step 1: Write the proportion equation
   99,431.27 : 137,215.18 = 54,719.27 : x
2. Step 2: Convert to fraction form
   99,431.27/137,215.18 = 54,719.27/x
3. Step 3: Cross multiply
   99,431.27x = 137,215.18 × 54,719.27
4. Step 4: Simplify right side
   99,431.27x = 7,508,315,151.23
5. Step 5: Solve for x
   x = 7,508,315,151.23/99,431.27
6. Step 6: Final answer
   x = 75,512.61